docs: add a PR template (#252)

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,14 @@
+### Description: 
+Summarize the changes you're submitting in a few sentences, including Jira ticket ATL-xxxx if applicable.
+Link to any discussion, related issues and bug reports to give the context to help the reviewer understand the PR.
+
+### Alternatives Considered (optional): 
+Link to existing ADR (Architecture Decision Record), if any. If relevant, describe other approaches explored and the selected approach. Documenting why the methods were not selected will create a knowledge base for future reference, helping prevent others from revisiting less optimal ideas.
+
+### Checklist: 
+- [] My PR follows the contribution guidelines of this project
+- [] My PR is free of third-party dependencies that don't comply with the [Allowlist](https://toc.hyperledger.org/governing-documents/allowed-third-party-license-policy.html#approved-licenses-for-allowlist)
+- [] I have commented my code, particularly in hard-to-understand areas
+- [] I have made corresponding changes to the documentation
+- [] I have added tests that prove my fix is effective or that my feature works
+- [] I have checked the PR title to follow the [conventional commit specification](https://www.conventionalcommits.org/en/v1.0.0/)